WO2014030567A1

WO2014030567A1 - Optical fiber plug and optical fiber connection device

Info

Publication number: WO2014030567A1
Application number: PCT/JP2013/071778
Authority: WO
Inventors: 克己幸西
Original assignee: 株式会社村田製作所
Priority date: 2012-08-23
Filing date: 2013-08-12
Publication date: 2014-02-27
Also published as: TWI483020B; TW201415107A

Abstract

The purpose of the present invention is to provide an optical fiber plug and an optical fiber connection device including the plug capable of minimizing residual bubbles between the end face of the optical fiber and the plug. An end of an optical fiber (60) constituted by a core wire and a coating material covering the core wire may be inserted into the optical fiber plug (40). The optical fiber plug has recessed portions (D3, D4) into which a transparent resin is injected. Further, the recessed portions are provided on surfaces (S7, S12) different from inner peripheral surfaces (S20, S22) where insertion slots (H7, H8) are provided for insertion of the optical fiber. Further, the recessed portions are provided at a section in the plug positioned at the terminal portion of the optical fiber where the core wire is exposed.

Description

Optical fiber plug and optical fiber connection device

The present invention relates to a plug attached to an end of an optical fiber and an optical fiber connection device including the plug, and more particularly to a plug used for mounting an optical fiber on a receptacle and an optical fiber connection device including the plug.

For example, a plug described in Patent Document 1 is known as a plug attached to an end of a conventional optical fiber. In this type of plug 500, as shown in FIG. 16, the optical fiber 501 is fixed to the plug 500 by inserting the optical fiber 501 from the recess D500 provided on the side surface of the plug 500 and pouring resin into the recess D500. .

However, in the plug 500, when resin is poured into the concave portion D500, air is entrained, and air bubbles may remain in the vicinity of the end of the optical fiber 501, that is, between the end face of the optical fiber 501 and the plug 500. . Thereby, in the optical transmission module using the plug 500, there is a possibility that an optical loss occurs near the interface between the optical fiber 501 and the plug 500.

International Publication No. 2012/105354

Therefore, an object of the present invention is to provide an optical fiber plug and an optical fiber connection device including the plug, which suppresses bubbles remaining between the end face of the optical fiber and the plug.

An optical fiber plug according to one aspect of the present invention is
A plug into which an end of an optical fiber composed of a core wire and a covering material covering the core wire is inserted,
Having a first surface and a second surface;
An insertion port into which the optical fiber is inserted is provided in the first surface,
A first recess into which the transparent resin is injected is provided on the second surface;
Furthermore, the first concave portion is provided in a portion where the end portion of the optical fiber where the covering material is peeled off and the core wire is exposed, should be positioned,
It is characterized by.

An optical fiber connecting device according to one aspect of the present invention is
The optical fiber plug;
Optical fiber,
Transparent resin,
With
The transparent resin is a matching agent that is injected into the first recess and reduces the refractive action of light near the interface of the optical fiber;
It is characterized by.

In the optical fiber plug and the optical fiber connection device including the plug according to one aspect of the present invention, an insertion port into which the optical fiber is inserted is provided on the first surface of the plug, and the second of the plug A first recess is provided on the surface. That is, the first recess is provided on a surface different from the surface provided with the optical fiber insertion port. Further, the first recess is provided in the vicinity of the end face of the optical fiber. As described above, the first concave portion provided separately from the insertion port into which the optical fiber is inserted allows bubbles sandwiched between the end face of the optical fiber and the plug to be blocked by the optical fiber. You can easily get out. As a result, according to the optical fiber plug and the optical fiber connection device including the plug according to one embodiment of the present invention, it is possible to suppress the bubbles from remaining between the end face of the optical fiber and the plug.

According to the optical fiber plug and the optical fiber connection device including the plug according to one embodiment of the present invention, it is possible to suppress the remaining of bubbles between the end face of the optical fiber and the plug.

It is an appearance perspective view of an optical transmission module provided with an optical fiber connecting device concerning one embodiment. It is a disassembled perspective view of a receptacle. It is an external appearance perspective view which removed the metal cap and the positioning member from the receptacle. It is an external appearance perspective view of the state which removed the metal cap from the receptacle. It is an external appearance perspective view of a positioning member. It is the figure which planarly viewed the positioning member from the negative direction side of the z-axis direction. FIG. 6 is a diagram in which a mounting board and a plug are added to the cross section taken along the line CC or DD of the positioning member illustrated in FIG. 5. It is an external appearance perspective view of a metal cap. 1 is an external perspective view of an optical fiber connection device according to an embodiment. It is the figure which planarly viewed the plug concerning one embodiment from the negative direction side of the z-axis direction. It is a figure of the manufacturing process of a receptacle. It is an external appearance perspective view of the optical fiber connection device containing the plug provided with the protection part. It is the figure which planarly viewed the optical fiber connection device containing the plug provided with the protection part from the positive direction side of the z-axis direction. It is an external appearance perspective view of the optical fiber connection device containing the plug provided with the alignment member and the protection part. It is the figure which planarly viewed the optical fiber connection device containing the plug provided with the alignment member and the protection part from the positive direction side of the z-axis direction. It is sectional drawing of the same kind of plug as the plug of patent document 1. FIG.

Hereinafter, an optical transmission module including an optical fiber connection device according to an embodiment and a manufacturing method thereof will be described.

(Configuration of optical transmission module See FIGS. 1 to 3)
Hereinafter, a configuration of an optical transmission module including an optical fiber connection device according to an embodiment will be described with reference to the drawings. Note that the vertical direction of the light transmission module 10 is defined as the z-axis direction, and the direction along the long side of the light transmission module 10 when viewed in plan from the z-axis direction is defined as the x-axis direction. Furthermore, the direction along the short side of the optical transmission module 10 is defined as the y-axis direction. The x axis, the y axis, and the z axis are orthogonal to each other.

The optical transmission module 10 includes a receptacle 20 and an optical fiber connection device 70 as shown in FIG.

As shown in FIG. 2, the receptacle 20 includes a metal cap 30, a light receiving element array 50, a light emitting element array 100, a positioning member 200, a mounting substrate 22, a sealing resin 24, and a drive circuit 26.

The mounting substrate 22 has a rectangular shape when seen in a plan view from the z-axis direction, as shown in FIG. The surface mounting electrode E1 that contacts the land of the circuit board when the optical transmission module 10 is mounted on the circuit board is mounted on the surface on the negative side in the z-axis direction of the mounting board 22 (hereinafter referred to as the lower surface). (Not shown in FIG. 3) is provided.

On the surface on the positive direction side in the z-axis direction (hereinafter referred to as the upper surface) of the mounting substrate 22, a side L1 located on the negative direction side in the x-axis direction and a side L2 located on the negative direction side in the y-axis direction are formed. In the vicinity of the corner, a ground conductor exposed portion E2 is provided in which a part of the ground conductor provided in the mounting substrate 22 is exposed. The ground conductor exposed portion E2 has a rectangular shape having a long side in the x-axis direction when viewed from the positive side in the z-axis direction.

Further, on the upper surface of the mounting substrate 22, the mounting substrate 22 is provided in the vicinity of an angle formed by the side L1 positioned on the negative side in the x-axis direction and the side L3 positioned on the positive direction side in the y-axis direction. A ground conductor exposed portion E3 in which a part of the ground conductor is exposed is provided. The ground conductor exposed portion E3 has a rectangular shape having a long side in the x-axis direction when viewed from the positive side in the z-axis direction.

The light receiving element array 50 and the light emitting element array 100 are provided on the upper side of the mounting substrate 22 on the positive direction side in the x-axis direction. The light receiving element array 50 is an element including a plurality of photodiodes that convert an optical signal into an electric signal. The light emitting element array 100 is an element including a plurality of diodes that convert an electrical signal into an optical signal.

Further, the drive circuit 26 is provided further on the positive side in the x-axis direction than the light receiving element array 50 and the light emitting element array 100 in the portion on the positive side in the x-axis direction on the surface of the mounting substrate 22. The drive circuit 26 is a semiconductor circuit element for driving the light receiving element array 50 and the light emitting element array 100.

Further, as shown in FIG. 3, the drive circuit 26 has a rectangular shape having a long side parallel to the y-axis direction when viewed in plan from the z-axis direction. The drive circuit 26 and the light receiving element array 50 are connected through wire U by wire bonding. Further, the drive circuit 26 and the light emitting element array 100 are connected to each other by wire bonding via the wire U. As a result, the electrical signal from the drive circuit 26 is transmitted to the light emitting element array 100 via the wire U, and the electrical signal from the light receiving element array 50 is transmitted to the drive circuit 26 via the wire U. In addition, the drive circuit 26 and the mounting substrate 22 are connected by wire bonding via the wire U.

As shown in FIG. 3, the sealing resin 24 includes a sealing portion 24a and leg portions 24b to 24e, and is made of a transparent resin such as an epoxy resin. The sealing portion 24 a has a substantially rectangular parallelepiped shape, and is provided on a portion of the upper surface of the mounting substrate 22 on the positive direction side in the x-axis direction. The sealing portion 24 a covers the light receiving element array 50, the light emitting element array 100, and the drive circuit 26.

The leg portions 24b and 24c are provided at intervals so as to be arranged in this order from the negative direction side in the x-axis direction to the positive direction side. The leg portions 24b and 24c are rectangular parallelepiped members that protrude toward the side L2 of the mounting substrate 22 from the negative side surface in the y-axis direction of the sealing portion 24a. Further, a space H1 into which a convex portion C3 of a metal cap 30 described later is fitted is provided between the leg portion 24b and the leg portion 24c.

The leg portions 24d and 24e are provided at intervals so as to be arranged in this order from the negative direction side to the positive direction side in the x-axis direction. The leg portions 24d and 24e are rectangular parallelepiped members that protrude toward the side L3 of the mounting substrate 22 from the surface on the positive side in the y-axis direction of the sealing portion 24a. Further, a space H2 is provided between the leg portion 24d and the leg portion 24e in which a convex portion C6 of the metal cap 30 described later is fitted.

(Configuration of positioning member See FIGS. 4 to 7)
Next, the positioning member 200 will be described with reference to the drawings.

As shown in FIG. 4, the positioning member 200 is provided across the mounting substrate 22 and the sealing resin 24 so as to cover the upper surface of the mounting substrate 22 and substantially the entire sealing resin 24. The positioning member 200 includes a positioning member 220 for a light emitting element and a positioning member 240 for a light receiving element. The

positioning members

220 and 240 are provided so as to be arranged in this order from the negative direction side in the y-axis direction toward the positive direction side. The positioning member 200 is made of, for example, an epoxy or nylon resin.

The positioning member 220 for the light emitting element has a rectangular shape when viewed in plan from the z-axis direction. Furthermore, the positioning member 220 includes a plug guide portion 222 and an optical coupling portion 224 as shown in FIG.

The plug guide portion 222 constitutes a portion of the positioning member 220 on the negative direction side of the x axis. Further, as shown in FIG. 6, the plug guide portion 222 is a plate-like member having a rectangular shape when viewed in plan from the z-axis direction. Furthermore, the end surface S1 on the positive side in the x-axis direction of the plug guide part 222 faces the surface on the negative direction side in the x-axis direction of the sealing resin 24 as shown in FIG. That is, the plug guide portion 222 is positioned on the negative side in the x-axis direction with respect to the sealing resin 24 on the mounting substrate 22.

Further, as shown in FIG. 5, a groove G1 for guiding a plug 40 to be described later is provided substantially parallel to the x-axis at the approximate center in the y-axis direction on the upper surface of the plug guide portion 222. In the plug guide portion 222, a portion on the negative direction side in the y-axis direction from the groove G1 is referred to as a flat portion F1, and a portion on the positive direction side in the y-axis direction from the groove G1 is referred to as a flat portion F2. As shown in FIG. 7, the height h1 of the groove G1 from the mounting substrate 22 in the z-axis direction is lower than the height h2 of the sealing resin 24 in the z-axis direction.

As shown in FIG. 5, the optical coupling portion 224 constitutes a portion on the positive direction side in the x-axis direction of the positioning member 220 and is placed on the sealing resin 24.

Furthermore, the optical coupling part 224 has a main body 226 and an abutting part 228. The main body 226 has a rectangular parallelepiped shape. The abutting portion 228 protrudes from the end surface S2 on the negative side in the x-axis direction of the main body 226 along the flat portion F1 of the plug guide portion 222 to the approximate center of the flat portion F1 in the x-axis direction. Thereby, the optical coupling part 224 is L-shaped when viewed in plan from the z-axis direction. Note that the end surface of the abutting portion 228 on the negative side in the x-axis direction is referred to as an end surface S3. The optical coupling portion 224 is provided with a concave portion D1 and a convex lens 230.

The concave portion D1 is provided in the vicinity of the side L4 on the positive side of the optical coupling portion 224 in the y-axis direction. In addition, the recess D1 overlaps the light emitting element array 100 when viewed in plan from the z-axis direction. Further, the recess D1 overlaps with the optical axis of the optical fiber 60 connected to the plug 40 described later when viewed in plan from the x-axis direction. The optical axis of the optical fiber 60 is parallel to the x axis. Further, the concave portion D1 has a rectangular shape when viewed in plan from the z-axis direction. Furthermore, as shown in FIG. 7, the recess D 1 has a V shape when viewed in plan from the y-axis direction.

The inner peripheral surface on the negative side in the x-axis direction of the recess D1 is a total reflection surface R1. The total reflection surface R1 is parallel to the y-axis and tilted 45 ° counterclockwise with respect to the z-axis when viewed from the negative side in the y-axis direction. Further, the refractive index of the positioning member 200 is sufficiently larger than that of air. Therefore, the laser beam B1 emitted from the light emitting element array 100 to the positive z-axis direction is incident on the optical coupling unit 224, and is totally reflected by the total reflection surface R1 to the negative x-axis side, thereby causing the plug 40 To the optical fiber 60 via At this time, when the light trace of the laser beam B1 is viewed in plan from the y-axis direction, the angle formed by the optical axis of the laser beam B1 emitted from the light emitting element array 100 and the total reflection surface R1 is 45 °, and the optical fiber 60 The angle formed by the optical axis of the laser beam B1 toward the total reflection surface R1 is 45 °. That is, the angle formed by the total reflection surface R1 and the optical axis of the optical fiber 60 is equal to the angle formed by the total reflection surface R1 and the light emitting element array 100.

The convex lens 230 is provided on the lower surface of the optical coupling part 224 as shown in FIGS. Further, the convex lens 230 overlaps the light emitting element array 100 when viewed in plan from the z-axis direction. Thereby, the convex lens 230 faces the light emitting element array 100 and is positioned on the optical path of the laser beam B1. In addition, the convex lens 230 has a semicircular shape that protrudes toward the negative direction side of the z-axis when viewed from a direction orthogonal to the z-axis. Accordingly, the laser beam B1 emitted from the light emitting element array 100 is condensed or collimated by the convex lens 230 and travels toward the total reflection surface R1.

The positioning member 240 for the light receiving element has a rectangular shape when viewed in plan from the z-axis direction. Further, as shown in FIG. 5, the positioning member 240 includes a plug guide portion 242 and an optical coupling portion 244.

The plug guide portion 242 constitutes a portion of the positioning member 240 on the negative direction side of the x axis. Further, as shown in FIG. 6, the plug guide portion 242 is a plate-like member having a rectangular shape when viewed in plan from the z-axis direction. Furthermore, the end surface S4 on the positive direction side in the x-axis direction of the plug guide portion 242 faces the surface on the negative direction side in the x-axis direction of the sealing resin 24 as shown in FIG. That is, the plug guide part 242 is located on the negative side in the x-axis direction with respect to the sealing resin 24 on the mounting substrate 22.

Further, as shown in FIG. 5, a groove G2 for guiding a plug 40 to be described later is provided substantially parallel to the x-axis at the approximate center in the y-axis direction on the upper surface of the plug guide portion 242. In the plug guide portion 242, a portion on the negative side in the y-axis direction from the groove G2 is referred to as a flat portion F3, and a portion on the positive direction side in the y-axis direction from the groove G2 is referred to as a flat portion F4. As shown in FIG. 7, the height h3 of the groove G2 from the mounting substrate in the z-axis direction is lower than the height h2 of the sealing resin 24 in the z-axis direction.

As shown in FIG. 5, the optical coupling portion 244 constitutes a portion on the positive side in the x-axis direction of the positioning member 240 and is placed on the sealing resin 24.

Furthermore, the optical coupling part 244 has a main body 246 and an abutting part 248. The main body 246 has a rectangular parallelepiped shape. The abutting portion 248 protrudes from the end surface S5 on the negative side in the x-axis direction of the main body 246 to the approximate center in the x-axis direction of the flat portion F4 along the flat portion F4 of the plug guide portion 242. Thereby, the optical coupling unit 244 has an L shape when viewed in plan from the z-axis direction. The end surface on the negative direction side in the x-axis direction of the abutting portion 248 is referred to as an end surface S6. The optical coupling portion 244 is provided with a concave portion D2 and a convex lens 250.

The concave portion D2 is provided in the vicinity of the side L5 on the negative side of the optical coupling portion 244 in the y-axis direction. The concave portion D2 overlaps the light receiving element array 50 when viewed in plan from the z-axis direction. Further, the recess D2 overlaps with the optical axis of the optical fiber 60 connected to the plug 40 described later when viewed in plan from the x-axis direction. The optical axis of the optical fiber 60 is parallel to the x axis. Further, the recess D2 has a rectangular shape when viewed in plan from the z-axis direction. Further, as shown in FIG. 7, the recess D 2 has a V shape when viewed in plan from the y-axis direction.

The inner peripheral surface on the negative direction side in the x-axis direction of the recess D2 is a total reflection surface R2. The total reflection surface R2 is parallel to the y-axis and tilted 45 ° counterclockwise with respect to the z-axis when viewed from the negative side in the y-axis direction. Further, the refractive index of the positioning member 200 is sufficiently larger than that of air. Accordingly, the laser beam B2 emitted from the optical fiber 60 to the positive direction side in the x-axis direction is incident on the optical coupling portion 244, and is totally reflected by the total reflection surface R2 to the negative direction side in the z-axis direction. The process proceeds to the light receiving element array 50 via 24. At this time, when the light trace of the laser beam B2 is viewed in plan from the y-axis direction, the angle formed by the optical axis of the laser beam B2 emitted from the optical fiber 60 and the total reflection surface R2 is 45 °, and the light receiving element array 50 The angle formed by the optical axis of the laser beam B2 heading toward and the total reflection surface R2 is 45 °. That is, the angle formed by the total reflection surface R2 and the optical axis of the optical fiber 60 is equal to the angle formed by the total reflection surface R2 and the light receiving element array 50.

The convex lens 250 is provided on the lower surface of the optical coupling portion 244 as shown in FIGS. The convex lens 250 overlaps the light receiving element array 50 when viewed in plan from the z-axis direction. As a result, the convex lens 250 faces the light receiving element array 50 and is positioned on the optical path of the laser beam B2. Further, the convex lens 250 has a semicircular shape that protrudes toward the negative direction side of the z-axis when viewed from a direction orthogonal to the z-axis. Therefore, the laser beam B 2 emitted from the optical fiber 60 is reflected by the total reflection surface R 2, then condensed or collimated by the convex lens 250, and travels toward the light receiving element array 50.

(Structure of metal cap See FIGS. 1 and 8)
Next, the metal cap 30 will be described with reference to the drawings.

The metal cap 30 is manufactured by bending a single metal plate (for example, SUS301) into a U-shape. Further, as shown in FIG. 1, the metal cap 30 covers the positioning member 200 from the positive direction side in the z-axis direction, the positive direction side in the y-axis direction, and the negative direction side in the y-axis direction. An opening A3 into which a plug 40 described later is inserted is formed on the negative side of the receptacle 20 in the x-axis direction.

The metal cap 30 includes a top plate portion 32 and

side plate portions

34 and 36 as shown in FIG. The top plate portion 32 is parallel to a plane orthogonal to the z-axis and has a rectangular shape. The side plate portion 34 is formed by bending the metal cap 30 from the long side L6 on the negative direction side in the y-axis direction of the top plate portion 32 to the negative direction side in the z-axis direction. The side plate portion 36 is formed by bending the metal cap 30 from the long side L7 on the positive side in the y-axis direction of the top plate portion 32 to the negative direction side in the z-axis direction.

Engaging portions 32 a and 32 b for fixing the plug 40 to the receptacle 20 are provided on the negative side of the top plate portion 32 in the x-axis direction. The engaging portions 32a and 32b are provided in this order from the negative direction side in the y-axis direction toward the positive direction side.

The engaging portions 32 a and 32 b are formed by making a U-shaped cut in the top plate portion 32. Specifically, the engaging portions 32a and 32b have a U-shaped notch opened in the positive direction side in the x-axis direction in the top plate portion 32, and a portion surrounded by the U-shaped notch is formed in the z-axis direction. It is formed by bending so as to be dented in the negative direction side. Thus, the engaging portions 32a and 32b have a V-shape that protrudes in the negative direction side in the z-axis direction when viewed in plan from the y-axis direction.

Further, engaging portions 32c and 32d for fixing the plug 40 to the receptacle 20 are provided on the short side L8 on the negative side of the top plate portion 32 in the x-axis direction. The engaging portions 32c and 32d are metal pieces that protrude from the top plate portion 32 toward the negative side in the x-axis direction. The engaging portions 32c and 32d are bent so as to be recessed toward the negative direction side in the z-axis direction at a substantially central position in the x-axis direction in the engaging portions 32c and 32d. Thus, the engaging portions 32c and 32d have a V-shape protruding in the negative direction side in the z-axis direction when viewed in plan from the y-axis direction.

On the long side L9 on the negative direction side in the z-axis direction of the side plate portion 34, convex portions C1 to C3 projecting toward the negative direction side in the z-axis direction are directed from the negative direction side in the x-axis direction to the positive direction side. They are arranged in this order. The convex portions C1 to C3 are each fixed to the mounting substrate 22 with an adhesive. The convex portion C1 is connected to the ground conductor exposed portion E2 of the mounting substrate 22. Further, the convex portion C3 is fitted into a space H1 provided between the leg portion 24b and the leg portion 24c of the sealing resin 24. Thereby, the metal cap 30 is positioned with respect to the mounting substrate 22.

On the long side L10 on the negative direction side in the z-axis direction of the side plate 36, convex portions C4 to C6 projecting toward the negative direction side in the z-axis direction are directed from the negative direction side in the x-axis direction to the positive direction side. They are arranged in this order. The convex portions C4 to C6 are each fixed to the mounting substrate 22 with an adhesive. The convex portion C4 is connected to the ground conductor exposed portion E3 of the mounting substrate 22. Further, the convex portion C6 is fitted into a space H2 provided between the leg portion 24d and the leg portion 24e of the sealing resin 24. Thereby, the metal cap 30 is positioned with respect to the mounting substrate 22.

(Configuration of optical fiber connection device See FIGS. 7, 9, and 10)
Hereinafter, an optical fiber connection device 70 according to an embodiment will be described with reference to the drawings. The optical fiber connection device 70 includes an optical fiber 60, a plug 40 (optical fiber plug), and a transparent resin.

The optical fiber 60 is composed of a core wire and a covering material that covers the core wire, and the core wire is composed of a core and a clad. The core is made of a glass material, and the clad is made of a glass material or a glass material covered with a fluorine resin. Further, the covering material is made of a resin such as polyethylene.

The end of the optical fiber 60 is inserted into the plug 40 as shown in FIG. Further, the plug 40 includes a transmission side plug 42 and a reception side plug 46, both of which are made of epoxy or nylon resin or the like.

The transmission side plug 42 is used for fixing the optical fiber 60 to the positioning member 220. The transmission side plug 42 includes an optical fiber insertion portion 42a and a protrusion 42b.

The optical fiber insertion portion 42a constitutes a portion on the positive direction side in the y-axis direction of the transmission-side plug 42, and has a rectangular parallelepiped shape extending in the x-axis direction. The thickness of the optical fiber insertion portion 42a in the z-axis direction is thinner than the thickness in the y-axis direction. An opening A1 (second recess) is provided in a portion on the negative side in the x-axis direction of the optical fiber insertion portion 42a. A resin for fixing the optical fiber 60 is injected into the opening A1. Further, when the optical fiber 60 is inserted into the transmission side plug 42, the covered portion of the optical fiber 60 is positioned in the opening A1.

The opening A1 is formed by cutting out the surface S7 located on the upper surface of the optical fiber insertion portion 42a and the end surface S8 on the negative side in the x-axis direction. Further, an insertion port H7 for guiding the core wire of the inserted optical fiber 60 to the tip of the transmission side plug 42 is formed on the inner peripheral surface S20 (first surface) on the positive side in the x-axis direction of the opening A1. Is provided. Note that the number of insertion openings H7 corresponds to the number of optical fibers 60, and is two in this embodiment.

Furthermore, a concave portion D3 (first concave portion) for injecting a matching agent is provided in a portion on the positive side in the x-axis direction of the surface S7 (second surface) of the optical fiber insertion portion 42a. The matching agent is a transparent resin having a refractive index closer to the refractive index of the optical fiber than air, and matches the refractive index between the optical fiber 60 and the transmission side plug 42 to reduce light reflection. It is a transparent resin. In the recess D3, when the optical fiber 60 is inserted into the transmission-side plug 42, the end portion where the core wire of the optical fiber 60 is exposed is located. Further, the recess D3 is recessed from the surface S7 of the optical fiber insertion portion 42a toward the negative direction side in the z-axis direction. That is, the opening direction from the bottom of the recess D3 toward the opening is the z-axis direction. In addition, as shown in FIG. 7, the depth d1 of the recess D3 in the opening direction is shallower than the insertion depth d2 of the optical fiber 60.

An insertion port H7 is provided on the inner peripheral surface of the concave portion D3 on the negative side in the x-axis direction. The insertion port H7 is connected to the inner peripheral surface S20 on the positive direction side in the x-axis direction of the opening A1. Therefore, the core wire of the optical fiber 60 reaches the recess D3 from the opening A1 through the insertion port H7. The end surface of the core wire of the optical fiber 60 that has reached the recess D3 is positioned in the immediate vicinity of the inner peripheral surface S9 on the positive side in the x-axis direction of the recess D3. The optical fiber 60 is fixed to the transmission side plug 42 by a matching agent made of a transparent resin injected into the opening A1 and the recess D3, for example, an epoxy resin. The end face of the core wire of the optical fiber 60 is not in contact with the inner peripheral surface S9. This is to provide a gap that absorbs the expansion and contraction of the optical fiber 60 caused by temperature fluctuations and the like, and also to prevent a decrease in the transmittance of the resin due to white turbidity of the resin and shape deformation.

Here, the materials injected into the opening A1 and the recess D3 may be different materials. For example, a matching agent made of a transparent resin as described above is injected into the recess D3, and a resin for firmly fixing the optical fiber 60, that is, a colored resin that does not take into account the refractive index, etc. is injected into the opening A1. Is possible.

As shown in FIG. 10, a convex lens 44 is provided on the end surface S10 on the positive side in the x-axis direction of the optical fiber insertion portion 42a. The convex lens 44 has a semicircular shape protruding in the positive direction side in the x-axis direction when seen in a plan view from a direction orthogonal to the x-axis direction. Accordingly, the laser beam B1 emitted from the light emitting element array 100 and reflected by the total reflection surface R1 is condensed or collimated by the convex lens 44.

Further, the convex lens 44 overlaps the optical axis of the optical fiber 60 when viewed in plan from the x-axis direction. Accordingly, the laser beam B1 collected or collimated by the convex lens 44 passes through the resin of the optical fiber insertion portion 42a. The laser beam B 1 is transmitted to the core of the core of the optical fiber 60.

As shown in FIG. 9, a projection N1 that engages with the engaging portion 32a of the metal cap 30 is provided on the surface S7 of the optical fiber insertion portion 42a. The protrusion N1 is provided between the opening A1 and the recess D3 in the x-axis direction, and extends in the y-axis direction. Further, the protrusion N1 has a triangular shape protruding in the positive direction side in the z-axis direction when viewed in plan from the y-axis direction.

As shown in FIGS. 9 and 10, a convex portion C7 is provided on the lower surface of the optical fiber insertion portion 42a. The convex portion C7 corresponds to the groove G1 of the plug guide portion 222 of the positioning member 220. The convex portion C7 is provided in parallel to the x-axis from the end surface S8 toward the end surface S10.

As shown in FIGS. 9 and 10, the protruding portion 42b protrudes from the vicinity of the end portion on the negative side in the x-axis direction of the optical fiber insertion portion 42a toward the negative direction side in the y-axis direction. Thereby, the transmission side plug 42 is L-shaped. The protruding portion 42b functions as a grip portion when the transmitting side plug 42 is inserted and removed. Further, a substantially rectangular hollow hole is provided at the approximate center of the protrusion 42b when viewed in plan from the z-axis direction.

Note that the connection work between the transmission side plug 42 and the receptacle 20 is performed by pushing the convex portion C7 along the groove G1 to the positive side in the x-axis direction. At this time, the end surface S11 on the positive side in the x-axis direction of the protrusion 42b abuts against the end surface S3 of the abutting portion 228 of the positioning member 220 shown in FIG. At this time, the convex lens 44 is not in contact with the end surface S2 of the main body 226, and a gap of about 5 μm is provided. This is to prevent the transmittance from decreasing due to scratches and dirt on the convex lens 44 and the end surface S2 of the main body 226 due to contact.

Further, when the transmission side plug 42 and the receptacle 20 are connected, the engaging portion 32a of the metal cap 30 is engaged with the protrusion N1, and the engaging portion 32c is formed by the surface S7 and the end surface S8 of the transmission side plug 42. By engaging with the corner, the transmission side plug 42 is fixed to the receptacle 20.

The receiving side plug 46 is used to fix the optical fiber 60 to the positioning member 240. Moreover, the receiving side plug 46 is provided with the optical fiber insertion part 46a and the projection part 46b, as shown in FIG.

The optical fiber insertion portion 46a constitutes a portion on the negative direction side in the y-axis direction of the reception side plug 46, and has a rectangular parallelepiped shape extending in the x-axis direction. The thickness of the optical fiber insertion portion 46a in the z-axis direction is thinner than the thickness in the y-axis direction. An opening A2 (second concave portion) is provided in a portion on the negative direction side in the x-axis direction of the optical fiber insertion portion 46a. A resin for fixing the optical fiber 60 is injected into the opening A2. Further, when the optical fiber 60 is inserted into the receiving side plug 46, the covered portion of the optical fiber 60 is located in the opening A2.

The opening A2 is formed by cutting out the surface S12 located on the upper surface of the optical fiber insertion portion 46a and the end surface S13 on the negative side in the x-axis direction. An insertion port H8 for guiding the core wire of the inserted optical fiber 60 to the tip of the receiving side plug 46 is formed on the inner peripheral surface S22 (first surface) on the positive side in the x-axis direction of the opening A2. Is provided. The number of insertion ports H8 corresponds to the number of optical fibers 60, and is two in this embodiment.

Furthermore, a concave portion D4 (first concave portion) for injecting a matching agent is provided in a portion on the positive side in the x-axis direction of the surface S12 (second surface) of the optical fiber insertion portion 46a. When the optical fiber 60 is inserted into the receiving side plug 46, the end portion where the core wire of the optical fiber 60 is exposed is located in the recess D4. In addition, the recess D4 is recessed from the surface S12 of the optical fiber insertion portion 46a toward the negative side in the z-axis direction. That is, the opening direction from the bottom of the recess D4 toward the opening is the z-axis direction. Further, as shown in FIG. 7, the depth d3 of the recess D4 in the opening direction is shallower than the insertion depth d2 of the optical fiber 60.

An insertion port H8 is provided on the inner peripheral surface of the concave portion D4 on the negative side in the x-axis direction. The insertion port H8 is connected to the inner peripheral surface S22 on the positive direction side in the x-axis direction of the opening A2. Therefore, the core wire of the optical fiber 60 reaches the recess D4 from the opening A2 through the insertion port H8. The end surface of the core wire of the optical fiber 60 that has reached the recess D4 is positioned in the immediate vicinity of the inner peripheral surface S14 on the positive direction side in the x-axis direction of the recess D4. The optical fiber 60 is fixed to the receiving side plug 46 by a matching agent made of a transparent resin injected into the opening A2 and the recess D4, for example, an epoxy resin. In addition, the end surface of the core wire of the optical fiber 60 is not in contact with the inner peripheral surface S14.

Here, the materials injected into the opening A2 and the recess D4 may be different from each other. For example, a matching agent made of a transparent resin as described above is injected into the concave portion D4, and a resin for firmly fixing the optical fiber 60, that is, a colored resin that does not take into account the refractive index, etc., is injected into the opening A2. Is possible.

As shown in FIG. 10, a convex lens 48 is provided on the end surface S15 on the positive side in the x-axis direction of the optical fiber insertion portion 46a. The convex lens 48 has a semicircular shape protruding in the positive direction side in the x-axis direction when seen in a plan view from a direction orthogonal to the x-axis.

Further, the convex lens 48 overlaps the optical axis of the optical fiber 60 when viewed in plan from the x-axis direction. Accordingly, the laser beam B2 emitted from the optical fiber 60 is condensed or collimated by the convex lens 48 and proceeds to the total reflection surface R2. The laser beam B 2 is reflected by the total reflection surface R 2 and transmitted to the light receiving element array 50.

As shown in FIG. 9, a protrusion N2 that engages with the engaging portion 32b of the metal cap 30 is provided on the surface S12 of the optical fiber insertion portion 46a. The protrusion N2 is provided between the opening A2 and the recess D4 in the x-axis direction, and extends in the y-axis direction. Further, the protrusion N2 has a triangular shape protruding in the positive direction side in the z-axis direction when viewed in plan from the y-axis direction.

As shown in FIGS. 9 and 10, a convex portion C8 is provided on the lower surface of the optical fiber insertion portion 46a. The convex portion C8 corresponds to the groove G2 of the plug guide portion 242 of the positioning member 240. The convex portion C8 is provided in parallel to the x-axis from the end surface S13 toward the end surface S15.

As shown in FIGS. 9 and 10, the protrusion 46 b protrudes from the end on the negative side in the x-axis direction of the optical fiber insertion portion 46 a to the positive side in the y-axis direction. Thereby, the receiving side plug 46 is L-shaped. The protruding portion 46b functions as a grip portion when the receiving side plug 46 is inserted and removed. Further, a substantially rectangular hollow hole is provided in the approximate center of the protrusion 46b when viewed in plan from the z-axis direction.

Note that the connection work between the receiving side plug 46 and the receptacle 20 is performed by pushing the convex portion C8 along the groove G2 to the positive side in the x-axis direction. At this time, the end surface S16 on the positive side in the x-axis direction of the protruding portion 46b abuts against the end surface S6 of the abutting portion 248 of the positioning member 240 shown in FIG. At this time, the convex lens 48 is not in contact with the end surface S5 of the main body 246, and a gap of about 5 μm is provided. This is to prevent damage and dirt from occurring on the convex lens 48 and the end surface S5 of the main body 246 due to contact with each other, thereby reducing the transmittance.

Further, when the receiving side plug 46 and the receptacle 20 are connected, the engaging portion 32b of the metal cap 30 is engaged with the protrusion N2, and the engaging portion 32d is formed by the surface S12 and the end surface S13 of the receiving side plug 46. The receiving side plug 46 is fixed to the receptacle 20 by engaging with the corner.

In the optical transmission module 10 configured as described above, as shown in FIG. 7, the laser beam B 1 emitted from the light emitting element array 100 to the positive side in the z-axis direction passes through the sealing resin 24 and the positioning member 220. pass. Further, the laser beam B1 is reflected by the total reflection surface R1 to the negative direction side in the x-axis direction, passes through the plug 40, and is transmitted to the core of the optical fiber 60. Accordingly, the positioning member 220 plays a role of optically coupling the core of the optical fiber 60 and the light emitting element array 100.

Further, in the optical transmission module 10, the laser beam B 2 emitted from the optical fiber 60 to the positive side in the x-axis direction passes through the positioning member 240. Further, the laser beam B 2 is reflected by the total reflection surface R 2 to the negative direction side in the z-axis direction, passes through the sealing resin 24, and is transmitted to the light receiving element array 50. Therefore, the positioning member 240 plays a role of optically coupling the core of the optical fiber 60 and the light receiving element array 50.

(Production method)
Below, the manufacturing method of the optical transmission module 10 is demonstrated in order of the assembly of the receptacle 20, the plug 40, and the optical fiber 60, and the assembly of the optical transmission module 10. FIG.

(Receptacles Manufacturing Method See FIG. 11)
A method for manufacturing the receptacle 20 will be described with reference to the drawings.

First, solder is applied to the upper surface of a mother substrate 122 (not shown in the drawing) that is an assembly of the mounting substrates 22. More specifically, cream solder is pressed onto the mother substrate 122 on which the metal mask is placed using a squeegee. Then, the solder is printed on the mother substrate 122 by removing the metal mask from the mother substrate 122.

Next, the capacitor is placed on the solder of the mother board 122. Thereafter, heat is applied to the mother substrate 122 to solder the capacitor.

After soldering the capacitor, Ag paste is applied to a predetermined position on the mother board 122. The drive circuit 26, the light receiving element array 50, and the light emitting element array 100 are mounted on the coated Ag, and die bonding is performed. Further, the drive circuit 26 and the light receiving element array 50 are connected by wire bonding using Au wires, and the drive circuit 26 and the light emitting element array 100 are connected by wire bonding. Further, the drive circuit 26 and the mother substrate 122 are connected by wire bonding.

Thereafter, resin molding is performed on the capacitor, the drive circuit 26, the light receiving element array 50, and the light emitting element array 100. Furthermore, the plurality of mounting boards 22 are obtained by cutting the mother board 122 using a dicer.

Next, the positioning member 220 is placed on the mounting substrate 22 and the sealing resin 24. More specifically, a UV curable adhesive is applied to the negative region in the x-axis direction on the upper surface of the sealing portion 24a. After applying the adhesive, as shown in FIG. 11, the position of the center T100 of the light emitting part of the light emitting element array 100 is confirmed by the position recognition camera V1.

Next, the mounting machine V2 for placing the positioning member 220 on the sealing resin 24 picks up and picks up the positioning member 220. Then, with the mounting machine V2 adsorbing the positioning member 220, the position recognition camera V3 confirms the position of the lens center T230 of the convex lens 230 of the positioning member 220.

From the position data of the center T100 of the light emitting part of the light emitting element array 100 confirmed by the position recognition camera V1 and the position data of the lens center T230 of the convex lens 230 of the positioning member 220 confirmed by the position recognition camera V3, the light emitting element array 100. The relative position between the light emitting part and the convex lens 230 is calculated. Based on the calculated result, the movement amount of the onboard machine V2 is determined.

Next, the positioning member 220 is moved by the determined movement amount by the mounting machine V2. Thereby, the lens center T230 of the convex lens 230 and the optical axis of the light emitting element array 100 coincide.

In parallel with the mounting operation of the positioning member 220, the positioning member 240 is mounted on the mounting substrate 22 and the sealing resin 24. More specifically, after applying a UV curable adhesive to the negative region in the x-axis direction on the upper surface of the sealing portion 24a, as shown in FIG. 11, the center of the light receiving portion of the light receiving element array 50 is obtained. The position T50 is confirmed by the position recognition camera V4.

Next, the mounting machine V5 for mounting the positioning member 240 on the sealing resin 24 picks up and picks up the positioning member 240. Then, the position of the lens center T250 of the convex lens 250 of the positioning member 240 is confirmed by the position recognition camera V6 with the mounting machine V5 sucking the positioning member 240.

From the position data of the center T50 of the light receiving unit of the light receiving element array 50 confirmed by the position recognition camera V4 and the position data of the lens center T250 of the convex lens 250 of the positioning member 240 confirmed by the position recognition camera V6, the light receiving element array 50. The relative position between the light receiving unit and the convex lens 250 is calculated. Based on the calculated result, the movement amount of the onboard machine V5 is determined.

Next, the positioning member 240 is moved by the determined movement amount by the mounting machine V5. Thereby, the lens center T250 of the convex lens 250 and the optical axis of the light receiving element array 50 coincide.

Irradiate ultraviolet rays to the

positioning members

220 and 240 arranged. During ultraviolet irradiation, the

positioning members

220 and 240 are pressed against the mounting substrate 22 and the sealing resin 24 by the mounting machines V2 and V5. Thus, when the UV curable adhesive between the positioning

members

220 and 240 and the sealing resin 24 is cured, the

positioning members

220 and 240 are not displaced and the mounting substrate 22 and the sealing resin are sealed. It is fixed to the resin 24.

Next, the metal cap 30 is attached to the mounting substrate 22 on which the positioning member 200 is placed. More specifically, on the upper surface of the mounting substrate 22, the space H1 between the leg portions 24b and 24c of the sealing resin 24, the space H2 between the leg portions 24d and 24e, and the metal cap 30 A thermosetting adhesive such as epoxy is applied to the portion where the convex portions C2 and C5 are in contact. Further, a conductive paste such as Ag is applied to the ground conductor exposed portions E2 and E3 of the mounting substrate 22.

After applying the adhesive and the conductive paste, the convex portion C3 of the metal cap 30 is fitted into a portion sandwiched between the leg portion 24b and the leg portion 24c of the sealing resin 24 on the mounting substrate 22, that is, the space H1. Further, the convex portion C6 is fitted into a portion sandwiched between the leg portion 24d and the leg portion 24e of the sealing resin 24, that is, the space H2. Thereby, the position of the metal cap 30 with respect to the mounting substrate 22 is determined. Simultaneously with the positioning of the metal cap 30, the convex portions C1 to C6 come into contact with the adhesive or conductive paste on the mounting substrate 22.

After fitting the metal cap 30, heat is applied to the mounting substrate 22 to cure the adhesive and the conductive paste. Thereby, the metal cap 30 is fixed to the mounting substrate 22. Note that, by attaching the metal cap 30 to the mounting substrate 22, the convex portions C 1 and C 4 of the metal cap 30 come into contact with the ground conductor exposed portions E 2 and E 3 of the mounting substrate 22. Thereby, the metal cap 30 is connected to the ground conductor in the mounting substrate 22 and is kept at the ground potential. The receptacle 20 is completed by the process as described above.

(Connecting method of plug and optical fiber)
First, the optical fiber 60 inserted into the plug 40 is cut into a predetermined length.

Next, the coating near the tip of the optical fiber 60 is removed using an optical fiber stripper. After removing the coating in the vicinity of the tip, cleaving is performed to bring out the cleavage plane of the core wire of the optical fiber 60.

Next, the optical fiber 60 is pushed through the openings A1 and A2 so that the end of the core wire of the optical fiber 60 comes close to the surfaces S9 and S14 of the plug 40. Further, a transparent resin such as an epoxy resin for fixing the optical fiber 60 is injected into the openings A1 and A2 and the recesses D3 and D4 of the plug 40 shown in FIG. Then, the optical fiber 60 is fixed to the plug 40 by curing the transparent resin.

(Assembling method of optical transmission module)
The plug 40 is connected to the receptacle 20. As described above, the plug 40 is connected to the grooves G1 and G2 of the

positioning members

220 and 240 along the protrusions C7 and C8 of the plug 40 and the opening provided between the metal cap 30 and the receptacle 20. This is performed by pushing from A3 toward the positive side in the x-axis direction. The optical transmission module 10 is completed through the manufacturing process as described above.

(effect)
In the plug 40 and the optical fiber connection device 70, insertion ports H7 and H8 into which the optical fiber 60 is inserted are provided in the inner peripheral surfaces S20 and S22 of the

plugs

42 and 46, and concave portions are formed in the surfaces S7 and S12 of the

plugs

42 and 46. D3 and D4 are provided. That is, the recesses D3 and D4 are provided on a surface different from the surface where the insertion ports H7 and H8 of the optical fiber 60 are provided. Further, the recesses D3 and D4 are provided in the vicinity of the end face of the optical fiber 60. As described above, the bubbles sandwiched between the end face of the optical fiber 60 and the

plugs

42 and 46 by the recesses D3 and D4 provided separately from the insertion openings H7 and H8 into which the optical fiber 60 is inserted are converted into the optical fiber 60. It is possible to easily get out of the

plugs

42 and 46 without being disturbed. As a result, according to the plug 40, air bubbles are prevented from remaining between the end face of the optical fiber 60 and the plug 40.

Also, the depths d1 and d3 of the recesses D3 and D4 in the opening direction from the bottom of the recesses D3 and D4 toward the opening are shallower than the insertion depth d2 of the optical fiber 60. Therefore, the concave portions D3 and D4 are shallow concave portions as compared with the concave portion D501 extending in the extending direction of the optical fiber. Thereby, the air bubbles sandwiched between the end face of the optical fiber 60 and the plug 40 can be more surely escaped.

Furthermore, the opening direction of the recesses D3 and D4 is parallel to the z-axis direction and orthogonal to the extending direction of the optical fiber 60. The thickness of the optical fiber insertion portion 42a in the z-axis direction is thinner than the thickness in the y-axis direction. Thereby, the distance from the bottom part of recessed part D3, D4 to the opening part of recessed part D3, D4 located in the upper surface of a plug becomes the shortest compared with the case where the opening direction of recessed part D3, D4 is another direction. . Therefore, the air bubbles sandwiched between the end face of the optical fiber 60 and the plug 40 can be more easily escaped from the recesses D3 and D4.

By the way, in the plug 40, openings A1 and A2 (second recesses) are provided in addition to the recesses D3 and D4 provided in the portion where the end portion of the optical fiber 60 is to be located. Thereby, since the matching agent or the adhesive can be injected also into the openings A1 and A2, the optical fiber 60 can be more firmly fixed to the plug 40.

Further, different materials can be injected into the recesses D3 and D4 and the openings A1 and A2, respectively. Thereby, it is possible to select such that the material giving priority to the refractive index is injected into the recesses D3 and D4 and the material giving priority to the adhesiveness is injected into the openings A1 and A2.

Furthermore, the plug 40 is provided with protrusions 42b and 46b. The protrusions 42b and 46b function as gripping portions when the plug 40 is inserted and removed. As a result, the optical fiber 60 is gripped and the plug 40 is not inserted / extracted, so that the optical fiber 60 is not damaged and the plug can be inserted / extracted more easily than the optical fiber 60 is gripped.

(Other embodiments)
The optical fiber plug and the optical fiber connection device according to the present invention are not limited to the above-described embodiments, and can be changed within the scope of the gist thereof.

For example, as shown in FIGS. 12 and 13, the protective portion P 1 may be provided by raising the periphery of the

convex lenses

44 and 48 in the plug 40. Thereby, since a foreign material is suppressed from contacting the

convex lenses

44 and 48 directly from the outside of the plug 40, damage to the

convex lenses

44 and 48 can be prevented.

Furthermore, as shown in FIGS. 14 and 15, the optical fiber connection device 70 may include an alignment member 80 that bundles a plurality of optical fibers 60. Thereby, since the extending direction of the plurality of optical fibers 60 faces in one direction, the

plugs

42 and 46 connected to the plurality of optical fibers 60 also face in one direction. Therefore, when the optical fiber connection device 70 includes the alignment member 80, the connection work between the plug 40 and the receptacle 20 is facilitated.

As described above, the present invention is useful for a plug attached to an end of an optical fiber and an optical fiber connecting device including the plug, and in particular, air bubbles remain between the end face of the optical fiber and the plug. It is excellent in that it can be suppressed.

A1, A2 opening (second recess)
d1, d3 Depth of recess d2 Depth of insertion of optical fiber D3, D4 Recess (first recess)
H7, H8 insertion slot S8, S12 1st surface S20, S24 Inner peripheral surface (2nd surface)
40 Plugs 42b, 46b Protrusion 60 Optical fiber 70 Optical fiber connection device

Claims

A plug into which an end of an optical fiber composed of a core wire and a covering material covering the core wire is inserted,
Having a first surface and a second surface;
An insertion port into which the optical fiber is inserted is provided in the first surface,
A first recess into which the transparent resin is injected is provided on the second surface;
Furthermore, the first concave portion is provided in a portion where the end portion of the optical fiber where the covering material is peeled off and the core wire is exposed, should be positioned,
An optical fiber plug characterized by
The depth of the first recess in the opening direction from the bottom of the first recess toward the opening of the first recess is shallower than the insertion depth of the optical fiber;
The optical fiber plug according to claim 1.
The thickness in the direction perpendicular to the insertion direction of the optical fiber is thinner than the thickness in the insertion direction,
The opening direction is a direction orthogonal to the insertion direction;
The optical fiber plug according to claim 1 or 2.
A second recess into which the optical fiber fixing resin is injected;
The second recess is provided in a portion where the portion covered with the coating material of the optical fiber is to be located;
The optical fiber plug according to any one of claims 1 to 3.
A protrusion that protrudes in a direction perpendicular to the insertion direction of the optical fiber is further provided;
The optical fiber plug according to any one of claims 1 to 4, wherein:
An optical fiber plug according to any one of claims 1 to 5,
Optical fiber,
Transparent resin,
With
The transparent resin is a matching agent that is injected into the first recess and reduces reflection of light near the interface of the optical fiber;
An optical fiber connecting device.
It further comprises a resin for fixing the optical fiber,
The optical fiber fixing resin is injected into the second recess and is made of a material different from the transparent resin.
The optical fiber connecting device according to claim 6.